Collapsible core



T. MIDGLEY, SR.

COLLAPSIBLE CORE. APPLICATION FILED MAR. 19, 1919. RENEWED FEB. 2. 1921.

Patented Sept. 6, 1921.

2 SHEETS-SHEET l.

T. MIDGLEY, SR.

COLLAPSIBLE CORE. 7 APPLICATION FILED'MAR.19, 1919- RENEWED FEB. 2,1921- Patented Sept. 6, 1921.

2 SHEETS-SHEET 2- UNITED STATES PATENT OFFICE.

THOMAS MIDGLEY, SR., OF HZAJVIPDEN, MASSACHUSETTS, ASSIG-NOR TO THE FISK RUBBER COMPANY, OF CHICOPEE FALLS, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

GOLLAPSIBLE CORE.

Specification of Letters Patent.

Patented Sept. 6, 1921.

Application filed Hatch 19, 1919, Serial No. 283,534. Renewed February 2, 1921. Serial No. 441,929.

To all whom it may concem Be it known that THOMAS MIDGLEY, Sn, a citizen of the United States, residing at Hampden, in the county of Hampden, Massachusetts, has invented certain new and useful Improvements in Collapsible Cores, of which the following is a specification.

This invention relates to cores and, more particularly, to collapsible cores designed for use in the manufacture of pneumatic tire casings, the object of the invention being to provide a structure of this nature to which a heating medium may be applied.

Another object of the invention is to provide a joint structure between the various core sections which enables free circulation of a'heating medium without the necessity of resorting to the use of awkward and bothersome bypath structures. In other Words, the invention aims to so form the joining portions of the various core sections that their more assemblage produces a continuous heating connectionv throughout the several sections of the core. I

- Other advantages will be apparent from the description herewith.

The preferred embodiment of my invention is shown in the accompanying sheets of drawings wherein similar characters of reference designate corresponding parts and wherein,

Figure 1 is a view showing my improved type of core in its assembled relation prior to the application of thetire parts thereon,

Fig. 2 is an enlarged cross-section taken on line'2.8 of Fig. 1,

Fig. 3 is a detailed sectional view showing the manner in which the abutting ends of the core sections register and are made tight for the passages between the interiors of adjacent sections, and

\ Fig. 4 is a slightly modified form of the invention.

As shown in Fig. 1, the core is made of four sections, the section 1 constituting what is known as the key piece and the remaining sections 2, 3 and 4 being of such form as to 7 complete the annulus. he abutting ends of these various sections are constructed so that when they are assembled, a circumferential separation between ends will be prevented by means of the spring ring 5 which is positioned therein and held in such position by means of the key 6. In other words, these abutting ends are provided with interengaging ofiset portions which function as hooks of plug and socket form such that their displacement circumferentially or outwardly is prevented by the expansion of the ring 5 into position all as explained in my co-pending application filed of evcin date Serial Number 283,533.

As is customary, the abutting ends of each of the sections are faced with plates 7 and 8 and these plates are also formed to present the plug and socket construction shown. The interior of each of the various core sections is hollowed out as shown at 9 and the various core sections are in communication with each other by means of the conduits 10 and 11, each of which is so located to pass centrally through the plug and socket structure. These plugs and sockets are also tapered slightly to closely interfit and in fact the parts are made to exactly fit when they are assembled to form a steam tlght union. In this manner, the passages 10 and 11 of each of the three joints equipped with them will always be in registry while the parts are assembled. In order to prevent the possible escape of any of the heating medium I have also provided each plug and socket with a semi-circular gasket receiving 'opening in which the gasket 12 may be inserted and 'which gasket firmly seals the section ends against the possible escape of any of the heating medium when the parts are wedged together. As is evident from Fig. 1, only three of the joints are provided with these registering passages, it being unnecessary to provide the fourth one with the same inasmuch as the heating medium may be introduced into the section 1 by means of the nipple shown at 13 and this heating medium then circulated throughout the core and withdrawn through the nipple shown at 14 as being connected with the section 3. It will of course be understood that the spring ring 5 is suitably slotted to permit its ready application to accommodate these nipples 13 and 14.

From the foregoing description, taken in connection with the accompanying sheets Y of drawings, it will be apparent that I have provided a type of structure which is self alining in so far as the continuity of the passages 10 and 11 is concerned. Further, no unnecessary structure is utilized in order interiors of the assembled sections.

to permit the complete circulation of a heating medium throughout the interior of the entire core.

' In the preferred embodiment of my invention the coressections, as above described, are preferably heated by the introduction of steam, or other heated fluid, into the hollow- It is obvious that the core as a whole may be heated in many other different-ways, without parting from the spirit of the invention: Therefore, a modification has been shown in Fig. 4, of the drawing, wherein the core consists of the usual interfitting-sections' 15, and

which. are held 'in assembled relation by means ofthe expansible ring structure 16, and in this instance the core sections are uniformly'heated by the application of an electrical current, which may be accomplished by means of the terminals 17. By associatmg electric conductors 18 with said terminals, current may be supplied to the entire core body, in order that the latter may be heated in a uniform manner and to the required temperature. What I claim is:

1. In a collapsible core, a plurality of core sections sha d to form an annulus, means whereby sai sections may be heated including a connection for the heating medium adapted to be established throu h the abut- .ting ends of the sections when-t e latter; are

assembled, and means for holding the-.sec-

tions in assembled relation.

2. A collapsible core of the type 'havin .when in assembled relation and being ro- 'yided with inter-en aging portions on t eir abuttmg surfaces,'c aracteriz'ed bythat construction of; said interengaging portions in which they provide a-connection for .a-heating medium betweemcertain of said sections.

3. In a'colla siblecore, a pluralityjof core sections sh rior of sai sections -being ofihollow form,

f means .wherebycommunication ma be estab- 1ished betweenat o saidsecplurality of sections forming an an us.-

' to form an annulus,.the inte-' interior of the assemblage, and means where- I by said sections are held assembled.

5. In a collapsible core, a plurality of core sections shaped to form an annulus, the interior of said sections being of hollowform, the abutting ends of each pair of sections except one'having communicating passages between them,'means for introducing a heating medium to one core. section having a closed end, means for withdrawing the heat- -ing medium from the other section having a closed end, and means whereby said sections are held assembled.

' 6. A sectional hollow core having abutting ends with passages for interior connection between the hollow sections, the portions of.

I said passages where they passthrough abutting-ends of the .sections having a substantial radial directionwill res to the core.

' -7. A sectional hollow .core aving abutting ends with passages folginterior. connection between the hollow sections, said passages making a sharp bend at their middle porcore in a radial direction whereby the expansion of sections into place will not disturb the alinement of p between sections.

In testimon whereo I aflix Witnesses: WHLIAH T. Wm'1'mC tions so as to pass through the joints of the 

